\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}
\mathbf{G_x} = \begin{bmatrix} 
-1 & 0 & +1 \\
-2 & 0 & +2 \\
-1 & 0 & +1 
\end{bmatrix} * \mathbf{A}
\ and\ 
\mathbf{G_y} = \begin{bmatrix} 
+1 & +2 & +1 \\
0 & 0 & 0 \\
-1 & -2 & -1 
\end{bmatrix} * \mathbf{A}
\end{equation*}
\end{document}
